Linux/PROCESSOR-SDK-AM437X: SSHD is not active, not present

Phillip Holtzman

Tool/software: Linux

We want to use secure copy (scp) to transfer files from host to EVM board, however SSHD is not available on the EVM Linux.

"/etc/init.d/sshd restart" does not work. There is no sshd process.

How do we rebuild Linux to include SSHD?

over 6 years ago

0 Bin Liu over 6 years ago

TI__Guru**** 167511 points

Hi Phillip,

You don't have to rebuild Linux to use scp. The filesystem in Processor SDK Linux doesn't use sshd for ssh server, but uses dropbear instead.

root@am437x-evm:~# ps ax | grep dropbear
16983 ? Ss 0:00 /usr/sbin/dropbear -i -r /etc/dropbear/dropbear_rsa_host_key -B

0 Phillip Holtzman over 6 years ago in reply to Bin Liu

Intellectual 380 points

That's good to know. I verified the dropbear process is executing on the AM437x Linux SDK.
How does the remote client communicate with the dropbear server?
Does scp use the same rsa key or is there a way to synchronize them or should I be using some other command?

0 Bin Liu over 6 years ago in reply to Phillip Holtzman

TI__Guru**** 167511 points

Hi Phillip,

dropbear is a open-source project, the Processor SDK Linux includes it as is. I haven't spend much time on it as it just works for me for scp or ssh, but I would think it uses the keys in the same way as sshd, but you can always check the open-source community or internet to be sure.

0 Phillip Holtzman over 6 years ago in reply to Bin Liu

Intellectual 380 points

A coworker provided this solution.

on the EVM, set Linux SDK to have static IP address 192.168.56.242:
edit /etc/network/interfaces

   iface eth0 inet static (change dhcp to static)
   address 192.168.56.242
   netmask 255.255.255.0
   gateway 192.168.56.1 (use ipconfig to get IP address of host PC)

on the host PC:
ssh root@192.168.56.242
scp filename root@192.168.56.242

0 Bin Liu over 6 years ago in reply to Phillip Holtzman

TI__Guru**** 167511 points

Thanks for sharing.
Yes, the ssh client commands are the same when communicating to dropbear or sshd.

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Linux/PROCESSOR-SDK-AM437X: SSHD is not active, not present